Twin coil cylinder question

[theflyingpig]

Hi all. I recently moved into an old house that has an open vented hot water cylinder. It has two coils, one from a solid fuel rayburn, and one from an oil fired boiler. We havnt yet lit the rayburn due to a suspect chimney. The central heating works fine off the oil boiler, all bar one radiator (in the bathroom).
Is it possible that this rad only gets hot when the rayburn is lit? I guess I'm asking if this is necessary for some reason?

Thanks in advance for any input.
Huey

 

[cross thread]

It could be,most solid fuel requir a heatsink

 

[theflyingpig]

Thanks, how is this plumbed? I can see the pipes coming from rayburn and going into cylinder, but can't see where radiator in question s fed from....

 

[oldbuffer]

Also possible that the bathroom radiator is on the hot water primary circuit. Does it come on when the oil boiler is on for heating water?

 

[theflyingpig]

No. I think it must be the heat sink as @ cross thread suggested. I found a good explanation of the plumbing of it....

What is a heat sink radiator?

A heat sink radiator should be at least 10% of the KW output of the “maximum output to water” of the stove (more if the stove manual says so and I have seen figures as high as 20%).

www.stovefitterswarehouse.co.uk

 

[Exedon]

Rayburn Royal by any chance ? If so all sounds very normal.